High efficiency multi-channel spectrometer

摘要

A multi-channel imaging spectrometer and method of use thereof. One example of the multi-channel imaging spectrometer includes a single entrance slit, a double pass reflective triplet and at least a pair of diffraction gratings. The spectrometer is configured to receive and collimate an input beam from the entrance slit, to split the collimated beam into two spectral sub-bands using a beamsplitter, and to direct each sub-band to one of the pair of diffraction gratings. The diffraction gratings are each configured to disperse the received portion of the collimated beam into its constituent colors, and redirect the dispersed outputs through the reflective triplet to be imaged into an image sensor located at a focal plane aligned with the entrance slit.

主权项

1. A multi-channel imaging spectrometer comprising:
a double pass reflective triplet optical subsystem configured to receive and collimate incident electromagnetic radiation and to provide a collimated output beam; a single entrance slit configured to direct the incident electromagnetic radiation to the reflective triplet; a first beamsplitter configured to receive the collimated output beam from the reflective triplet and to separate the collimated output beam into a first spectral channel and a remaining wavelength range; a second beamsplitter optically coupled to the first beamsplitter and configured to receive the remaining wavelength range from the first beamsplitter and to separate the remaining wavelength range into a second spectral channel and a third spectral channel; and at least three dispersive elements, each configured to receive and spectrally disperse a respective one of the first, second, and third spectral channels to provide corresponding first, second, and third dispersive outputs, wherein the first and second beamsplitters are configured to recombine the first, second, and third dispersed outputs into a combined dispersed output, and the reflective triplet is further configured to focus the combined dispersed output onto a focal plane co-located with entrance slit; and a first image sensor positioned at the focal plane and configured to produce an image from the combined dispersed output.